We host few twitter MAP cards to increase our mobile app installs. On our end, we get a list of customer IDFA’s who have successfully installed our app. Till now we have no knowledge of whether it is a result of the MAP ad or not.
I am looking for an API that i can use to query the twitter ad server with a/few customer IDFA/IDFA’s, and return whether that customer app install was due to a twitter ad that we scheduled. Can someone point me to the API documentation, if available?

This is essentially the purpose of many conversion tracking partners. The functionality to do this is not exposed via the Ads API, but is granted to the conversion tracking partners to do on behalf of Twitter (or Fabric Answers is the one that Twitter ourselves maintains).